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Use ofSuperpave Specifications
for Airport Pavements
Alexander (Sandy) Brown, P.Eng.Technical Director Ontario Hot Mix Producers Association
Canadian Field Engineer Asphalt Institute
Why use Superpave?
Asphalt cement has been PG graded since about 1995 soon it may not be possible to get CGSB Pen-Vis graded cement
Superpave aggregate gradations are prevent from Ontario eastward and are starting to be used in the western Provinces
Likely to be more cost effective to use readily available material
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FAA concerns regarding highway HMA specifications for airfields
FAA expects HMA to meet quality and performance standard of FAA s P-401 Airfields greater sensitivity to FOD and environmental
distresses Long proven track record with P-401
No motivation for airfield consultants to request a Modification of Standard to deviate from P-401 in the US
3
History Lesson - The Marshall Method
Developed by Bruce Marshall in late 1930s for Mississippi Highway Department
Further modified in 1943 for WWII Adopted as typical design method in 1949 Worked well as a design method into the 1980s Problems
Wheel loading began to increase Traffic on roads began to increase
Are we seeing similar loading issues on airfield pavements?
4September 2011
5Superpave
Developed in response to pressures on the US highway system
Strategic Highway Research Program (SHRP), authorized by Congress in 1987
A highly focused, $150 million, 5-year effort designed to improve the performance of highway materials and highway maintenance practices with 2 subsequent extensions
Adopted by all states within a few years (funded) Administered by Lead State teams
September 2011
6PG Grading System
PGPerformanceGrade
58 28
High TemperatureAverage 7-daymaximum pavementdesign temp
Low TemperatureMinimum pavementdesign temp
September 2011
LTPPBIND Software
http://www.fhwa.dot.gov/pavement/ltpp/bind/dwnload.cfmMay 2011
May 2011
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Typical Superpave Mixes
0
20
40
60
80
100
Sieve Size Raised to 0.45 Power (mm)
P
e
r
c
e
n
t
P
a
s
s
i
n
g
.075 2.36 2519
gap graded mix
coarse graded mix
fine graded mix
May 2011
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Superpave vs. Marshall
September 2011
Airfield Asphalt Pavement Technology Program (AAPTP)
FAA sponsored Research program carried out at Auburn University
Several research reports on using Superpave highway specifications for airport work
Program was suspended in 2010 but reports still online
Webinars and Reports still available online www.aaptp.us
12September 2011
AAPTP Projects
Many very interesting research reports Three dealt with Superpave
04-02: PGAC for Airfield Pavements 04-03: Superpave Mix Design for Airfield Pavements 06-05: Guidelines for Use of Highway Specs for HMA
Airport Pavements Full reports available on line
www.aaptp.us
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Item P-401 [Superpave]Engineering Brief No. 59A Item P-401 Plant Mix Bituminous Pavement
(Superpave) dated May 12, 2006 Interim Guidance Specification Use in Constructing
All Pavements: Runway, Taxiway, and Apron Considered a Modification of Standards
Approval at FAA Reg. Office Level [
Superpave Specifications Adopted Interim document was modified and adopted for
use AC 150/5370-10E dated Sept 30, 2009 Item P-401 (SP) approved for all runways and
taxiways Allows for the use of Superpave specification
without special approval No more barriers in the way of use of Superpave
specification
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Definitions to Remember
NMAS = One sieve size larger than the first sieve to retain more than 10 percent.
MAS = One sieve size larger than the nominal maximum size.
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P-401 GradationMAS
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NMASP-401(SP) Gradation
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Volk Field Runway Reconstruction
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Volk Field Runway Reconstruction
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Volk Field Runway Reconstruction
Mark Blow
AI Regional Engineer Offices and User Producer Groups
HawaiiHawaii
Bob Humer
Sandy Brown
Bob Horan
Greg Harder
Wayne Jones
AlaskaAlaska
AI HQs & Lab
Danny Gierhart
Dave Johnson
A Fast Overview!A Fast Overview!Thank You!Thank You!
Mixture Design Considerationsfor Airport Pavements